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https://issues.apache.org/jira/browse/SPARK-19013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801120#comment-15801120
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Steve Loughran commented on SPARK-19013:
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Note also that a config based documentation option would allow Spark to pick 
this feature up on Hadoop 2.7.x+, as all you'd need to do is deploy with 
core-site.xml, or a spark.hadoop option set to declare the relevant schemas. As 
s3n, s3a, EMR s3 , azure and google cloud all materialize the PUT in close(),  
all spark needs is the information, not any changes in the object store 
filesystem clients. 

> java.util.ConcurrentModificationException when using s3 path as 
> checkpointLocation 
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-19013
>                 URL: https://issues.apache.org/jira/browse/SPARK-19013
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.0.2
>            Reporter: Tim Chan
>
> I have a structured stream job running on EMR. The job will fail due to this
> {code}
> Multiple HDFSMetadataLog are using s3://mybucket/myapp 
> org.apache.spark.sql.execution.streaming.HDFSMetadataLog.org$apache$spark$sql$execution$streaming$HDFSMetadataLog$$writeBatch(HDFSMetadataLog.scala:162)
> {code}
> There is only one instance of this stream job running.



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